Heating device for sewing-machines



Patented Apr. 1|, |899.

f F. A. MILLS.

HEATING DEVICE FDR SEWING MACHINES. (Application led Sept. 9, 1896. Benewled Feb. 8, 1899.)`

(No Model.)

No. 623,1ol.

Patented Apr. Il, |899.

F. A. MILLS. HE'ATING DEVICE FOFLSEWING MACHINES.

l l (Application lfiled Sept. 9, 1896. Renewed Feb. 8, 1899.)

(No Model.)

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' UNITED STATES PATENT OEEIcE.

FRANCIS ARTHUR MILLS, OF METHUEN, MASSACHUSETTS,l ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE MILLS SEWING MACHINE COMPANY, OF

MAINE.

HEATING DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent N0. 623,101, dated AprilA 11, 1899. Application tiled September 9,1896. Renewed February 8, 1899. Serial No. 704,987. (No model.)

'To a/ZZ whom. t may concern.:

Be it known that LFRANcIs ARTHUR MILLS, a citizen of the United States, residing at Methuen, in the county of AEssex'and State of lvlassachusetts,have invented certain new and useful Improvements in Heating Devices for Wax-Thread Sewing-Machines, of which'the following is a specication.

My improvement resides in means for heating that part of a sewingmachine which contains the sewing mechanism, whereby such part of the machine is made aheating-radiator and forms a heating-chamber to keep the operating parts warm and the wax-thread in a soft and pliable condition.

In the accompanying drawings, in Figure l I have shown a waxthreadV shoe-sewing Inachine with means for steam circulation within the walls of the head which contains the stitch forming mechanism, whereby it Yis made a radiator for heating the working parts. Fig. 2 is a vertical sectionof the radiator part, showing lthe steam-circulating pipes and wall-ducts and provision whereby the frame which contains the operating parts can be raised and lowered upon its standard without interrupting the steam circulation. Fig. 3 shows the steam-circulation ducts in the left side or wall of the sewing-head, and Fig. 4. shows the steam-circulation ducts in the right side or wall of the sewing-head.

A steam-inlet pipe 2, Fig. 4, extends from the rear of the frame along its lower part, and rising connects, b'ya suitable coupling 3, with ducts or passages 4., made in the solid side or wall of the sewing-head 5, and which ducts extend to the front thereof and, traversing and crossing the solid part of the head,

extend to the opposite wall or side by a cross-duct 23 and by suitable ducts 6, Figs. 1, 2, and 3, connects, by suitable couplings 7, with an exhaust-pipe S, which passes to the rear of the machine, thereby giving' a steam circulation within the solid body of the sewing-head and making it a steam-heated radiator, while the space between the side plates forms a heating-chamber. From this head all the operating parts of the machine are heated and kept warm by radiation and the heat from which keeps the sewing-thread in a soft and pliable condition. ing-head'is mounted upon and within the front side of the frame which contains the cam-cylinders for operating the working parts of the machine, and this frame is mounted upon a standard 9 for vertical adjustment to suit the height ofthe operator. The base of 4the frame has a central screw-threadedstem l0, which snugly fits within the standard, which is hollow and unthreaded and within which it has a firm support by means of a screw-ring ll, fitted upon the screw-stem and resting upon the ltop of the standard, so as to form a support or seat for the working-head frame. This ring is turned when it is desired to raise or lower the machine. The upper end of the standard is split vertically,

and a clamp-screw passing through the split parts serves to clamp the hollow standard upon the screw-stem, and thus hold it firm when set to the desired height. The screw ring maintains its seat upon the standard in turning and adjusting the height of the working-head fralne when the standard is unclamped.

In the Vertical adjustment of the machine I provide for maintaining the continuity of the steam-circulating pipes by a telescoping Vconnection 13, Fig. 2, and a stuffing-box 14.

at such connection, whereby those parts of the pipes which are connected with the sewing-head frame will be raised and lowered with the frame within the telescoping pipe parts each of which is secured to the standard by the couplings l5.

The parts 2 and 8 of the inflow and exhaust pipes are screw-threaded at 16 and engage threaded holes in the base-plate 17 of the supporting head-frame, so thatin raising and lowering the latter the said pipes, which conn ect the head-frame will be relieved from strain at their couplings Sand 7. In this way the connection of the sewing-head pipes is maintained with the steam-boiler and the sewinghead kept at a temperature that will radiate a sufficient degree of heat to keep all the stitch-forming parts, their bearings, and connectionsin a heated condition.

The sew- 20, which places the thread in the barb of the needle 21, the carrier whereof is actuated by the lever 22.

The side and top plates of the sewing-head Vwithin this heated space and the looperworks in front of it the needle, its carrierand the looper will be kept heated and the thread in a soft and pliable condition. The wall-bores are advantageous in confining the heat within the solid metal and gives it out byA radiation, and thereby maintains a more equable heat for all the working parts of the machine.

I claim- 1. In a wax-thread sewing-machine, the head-section Which contains the sewing mechanism, having vertical and horizontal communicating bores within its side plates and a cross-bore within its top plate connecting thel bores of the side plates, combined with heatconducting pipes which connect the lower ends of the vertical bores and engage screwthreaded holes in the base-plate of the headsupporting frame, whereby the head-section is made a heat-radiator for the working parts and the pipe-couplings relieved of strain.

` 2. In a wax-thread shoe-sewing machine,

and in combination with means whereby the frame may be adjusted vertically upon a standard or support, steam-circulation pipes connecting passages or ducts within the solid walls of and traversing that part of the machine which contains the sewing mechanism, and telescoping and stuffing-box connections Y forA said pipes between their connection'with the head-supporting frameand the steam-supply, whereby the machine can be raised and lowered upon its support without interrupting its connection with the heating medium.

3. In a wax-thread sewing-machine, the

sewing-head containing the stitch-forming mechanism having its side and top plates provided With heat-conducting bores, and the fixed standard-support provided with heatconducting pipesections,combined with heatconducting pipe-sections on the head-supporting-frame, connecting the head-bores, having fixed connection with the head-supporting frame and telescoping with the iXedstandard pipe-sections, and suitable means whereby the head-supporting frame is made vertically adjustable upon the standard.

FRANCIS ARTHUR MILLS.

Witnesses:

PATRICK DEMPSEY, JOHN GRADY. 

